The American Electric Power plant in Rockport is thought to be the largest coal-fired plant in the world.

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Indiana's manufacturers and utilities won a partial victory Tuesday when the Supreme Court decided to look at one aspect of the Environmental Protection Agency's power to regulate greenhouse gases.

The court accepted six petitions - including one filed by Indiana and several other states - that sought to roll back EPA's regulatory clout over carbon dioxide emissions from power plants, refineries and factories. That could signal the court's dissatisfaction with a 2012 ruling by the U.S. Court of Appeals for the District of Columbia Circuit that affirmed the agency's authority under the ...